Can I put turbos on a naturally aspirated VR-4 engine?

so you have the SL?! If so, you'd have to change the pistons, rods, cams, injectors and a transmission (and a scatter sheild), because the SL trannies are prone to exploding under torque loads greater than 300lbs.

Scratch the transmission part( you'll still need the scatter sheild), as you advised that you have a VR-4 already!

No such thing as a NA VR4 engine. At least a stock one. Now if someone put a regular NA DOHC SL engine in a VR4 then you would need to completely rebuild it to handle the turbos. Those engines are 10:1 compression ratio which is way to high for a twin turbo set up. Now if someone just removed the turbos off a turbo engine then you may be able to slap some on. That is with the supporting items ( inner coolers, oil coolers, proper plumbing, ect). Look at your oil filter area. Are there two hoses bolted right by the filter going into the front drivers side bumper area(oil cooler)? If so then you do have a motor that is built to handle turbos. If no oil cooler connections then it's not factory built to handle turbos.

^ come one man, an NA VR4 engine means a vr4 that someone deleted the turbos on. Assuming all that was removed was the turbos and lines and such were just plugged... You need both turbos full exhaust turbo manifold, precats, downpipe.... intercooler pipping turbo oil lines turbo coolant lines possibly the vr4 oil pan if they swapped it to eliminate the oil drain lines intake bubble and turbo intake pipes I might be forgetting a few things but that is the majority of it best way to do it is to find someone parting out an entire car or if your planning on building a powerful car and not just a stock car go with a TD05 conversion